Earnings Per Share (Basic and Diluted Income Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 387	$ 58	$ 818	$ 495
Less: Allocation of earnings to net restricted stock awards	1	0	2	1
Net income from continuing operations available to common shareholders — basic	386	58	816	494
Net Income Attributable to DTE Energy Company — discontinued operations	0	(33)	0	106
Net income available to common shareholders — basic	$ 386	$ 25	$ 816	$ 600
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	193.0
Income from continuing operations (in dollars per share)	$ 2.00	$ 0.30	$ 4.22	$ 2.55
Income from discontinued operations (in dollars per share)	0	(0.17)	0	0.55
Basic Earnings per Common Share (in dollars per share)	$ 2.00	$ 0.13	$ 4.22	$ 3.10
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 387	$ 58	$ 818	$ 495
Less: Allocation of earnings to net restricted stock awards	1	0	2	1
Net income from continuing operations available to common shareholders — diluted	386	58	816	494
Net Income Attributable to DTE Energy Company — discontinued operations	0	(33)	0	106
Net income available to common shareholders — diluted	$ 386	$ 25	$ 816	$ 600
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	193.0
Average dilutive equity units and performance share awards (in shares)	1.0	1.0	1.0	1.0
Average number of common shares outstanding — diluted (in shares)	194.0	194.0	194.0	194.0
Income from continuing operations (in dollars per share)	$ 1.99	$ 0.30	$ 4.21	$ 2.55
Income from discontinued operations (in dollars per share)	0	(0.17)	0	0.55
Diluted Earnings per Common Share (in dollars per share)	$ 1.99	$ 0.13	$ 4.21	$ 3.10
Antidilutive securities excluded from computation of earnings per share (in shares)	10.1	11.1	10.2	11.5